本文關(guān)鍵詞： 下組煤 帶壓開(kāi)采 突水系數(shù) 阻滲強(qiáng)度 安全帶壓系數(shù)　出處：《中國(guó)礦業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著煤礦開(kāi)采深度不斷增加,煤層底板突水已成為威脅煤礦安全生產(chǎn)的主要礦井地質(zhì)災(zāi)害之一,研究采動(dòng)影響下下組煤底板隔水巖層的阻滲性能,對(duì)于底板突水的評(píng)價(jià)和防治具有重要意義。為此,本文以兗州礦區(qū)興隆莊煤礦下組煤底板帶壓開(kāi)采為工程背景,對(duì)其深部下組煤采區(qū)的突水危險(xiǎn)性進(jìn)行了綜合研究。根據(jù)礦井水文地質(zhì)資料及相鄰礦井的下組煤底板帶壓開(kāi)采資料,分析了興隆莊煤礦下組煤底板帶壓開(kāi)采條件。影響下組煤安全開(kāi)采的含水層主要為十三灰、十四灰和奧灰,井田范圍內(nèi)十四灰大部分沉缺,且十三灰與十四灰間隔厚度較小,將十三灰與十四灰并為同一含水層考慮。奧灰含水層富水性中等,主要通過(guò)斷裂構(gòu)造與其他含水層發(fā)生水力聯(lián)系。下組煤底板砂巖、薄層灰?guī)r及泥質(zhì)巖均為良好的隔水層,17煤與十三灰、十三灰與奧灰兩個(gè)隔水層段的巖性及其組合結(jié)構(gòu)、發(fā)育厚度對(duì)于下組煤底板帶壓開(kāi)采的安全性起到至關(guān)重要的作用。通過(guò)現(xiàn)場(chǎng)原位壓滲實(shí)驗(yàn),獲取兗州礦區(qū)下組煤不同巖性組合及結(jié)構(gòu)條件底板的阻滲性對(duì)比試驗(yàn)數(shù)據(jù),提出了適用于興隆莊煤礦下組煤底板不同巖性及結(jié)構(gòu)的阻水巖層平均阻滲強(qiáng)度建議值,在此基礎(chǔ)上建立基于阻滲條件的評(píng)價(jià)模型。綜合運(yùn)用突水系數(shù)法和阻滲條件對(duì)興隆莊煤礦下組煤帶壓開(kāi)采底板突水危險(xiǎn)性進(jìn)行了評(píng)價(jià)分區(qū),結(jié)果表明井田17煤正常結(jié)構(gòu)狀態(tài)底板在井田東南邊下一、下三等采區(qū)存在發(fā)生十三灰水突水的可能。對(duì)于構(gòu)造擾動(dòng)底板,根據(jù)煤層與含水層間阻水巖層厚度進(jìn)行分區(qū)評(píng)價(jià),結(jié)果表明發(fā)生十三灰水沿?cái)鄬訋?dǎo)滲的可能性很大,阻水巖層厚度小于60m時(shí),存在奧灰水沿?cái)鄬訋?dǎo)滲的可能,阻水巖層厚度大于60m時(shí)開(kāi)采16上煤對(duì)于落差不大于8m的斷層,底板阻水巖層可以有效地阻隔奧灰水沿?cái)鄬訋?dǎo)滲,開(kāi)采17煤時(shí),5m落差是斷層發(fā)生滲透破壞的臨界條件。最后以兗州礦區(qū)相鄰井田兩個(gè)下組煤工作面為例,對(duì)比分析突水系數(shù)法和阻滲條件評(píng)價(jià)下組煤底板帶壓開(kāi)采安全條件的適用性,結(jié)果表明阻滲強(qiáng)度能更加真實(shí)地反映底板阻水能力。此次基于阻滲條件對(duì)興隆莊煤礦下組煤底板帶壓開(kāi)采條件的評(píng)價(jià)結(jié)果能夠有效地指導(dǎo)井田下組煤開(kāi)采,為井田下組煤帶壓開(kāi)采水害防治提供技術(shù)保障。
[Abstract]:With the increasing of coal mining depth, water inrush from coal seam floor has become one of the main geological hazards threatening the safety of coal mine production. It is of great significance for the evaluation and prevention of floor water inrush. Therefore, this paper takes the coal floor pressure mining of Xinglongzhuang coal mine in Yanzhou mining area as the engineering background. The risk of water inrush in the deep coal mining area is studied synthetically. According to the hydrogeological data of the mine and the pressure mining data of the coal floor of the adjacent coal mine, the paper makes a comprehensive study on the risk of water inrush in the deep coal mining area. The pressure mining conditions of the coal floor in the lower formation of Xinglongzhuang coal mine are analyzed. The aquifer that affects the safe mining of the lower coal is mainly 13 ash, 14 ash and Ordovician ash, and most of the 14 ash in the mine field is deficient. And the thickness of 13 ash and 14 ash interval is small, 13 ash and 14 ash are considered as the same aquifer. The coal floor sandstone, thin layer limestone and argillaceous rock of the lower formation are all good water-separated strata, such as 17 coal and 13 ash. The lithology and its combination structure of 13 ash and Ordovician water barrier layer are very important for the safety of the coal floor pressure mining in the lower group. The in-situ pressure-osmosis experiment is carried out. The comparative test data of the impermeability of different lithologic assemblages and structural conditions of coal floor in Yanzhou mining area are obtained. The suggested values of the average impermeability strength of the water-resistant rock strata suitable for different lithology and structure of the coal floor of the lower formation of Xinglongzhuang Coal Mine are put forward. On the basis of this, the evaluation model based on impermeability condition is established, and the risk of water inrush on the floor of the lower coal seam of Xinglongzhuang Coal Mine is evaluated by using the water inrush coefficient method and the impermeable condition. The results show that there is a possibility of 13 ash water inrush from the bottom plate of No. 17 coal under the southeast and the lower third class mining area of the mine field. The results show that the possibility of 13 ash water permeating along the fault zone is very high, when the thickness of water barrier rock layer is less than 60 m. There is the possibility of the permeation of Ordovician water along the fault zone. When the thickness of the water-blocking rock layer is more than 60 m, when the thickness of the water-blocking strata is more than 60 m, for the fault with the drop of less than 8 m, the water-proof rock layer of the bottom plate can effectively block the permeability of the water-proof layer along the fault zone. When mining 17 coal, the drop of 5 m is the critical condition of fault seepage failure. Finally, two coal faces of two lower groups in the adjacent mine field of Yanzhou mining area are taken as an example. Comparing and analyzing the applicability of safety condition of coal floor pressure mining under water inrush coefficient method and impermeable condition. The results show that the impermeable strength can reflect the water resistance ability of the floor more truthfully, and the evaluation result based on the impermeability condition to the mining condition of the coal floor pressure in the lower group of Xinglongzhuang Coal Mine can effectively guide the coal mining under the coal group in the mine field. It provides technical guarantee for prevention and cure of water hazard in coal mining of the lower coal group in the mine field.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD745

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